array_push() treats array as a stack, and pushes the passed variables onto the end of array. The length of array increases by the number of variables pushed. Has the same effect as:
$array = $var;
repeated for each var.
Returns the new number of elements in the array.
$stack = array("orange", "banana");
array_push($stack, "apple", "raspberry");
The above example will output:
 => orange
 => banana
 => apple
 => raspberry
If you use array_push() to add one element to the
array it's better to use
$array = because in that
way there is no overhead of calling a function.
array_push() will raise a warning if the first
argument is not an array. This differs from the
$var behaviour where a new array is created.